What are the reasons for a maintenance-free battery not charging?

[MaximusFitz]

Maintenance-free battery not charging is caused by internal grid disconnection or short-circuit damage. The repair methods for maintenance-free battery not charging are: 1. Full charge and discharge repair method: Fully charge the battery and then completely discharge it to repair the battery; 2. Water replenishment repair method: Open the battery cover and inject a certain amount of distilled water into each round hole; 3. Pulse repair method: Use a dedicated pulse repair instrument to charge and discharge the battery multiple times to eliminate sulfation. Battery charging precautions: 1. The battery should be charged directly without removing it to avoid data loss; 2. A battery voltage 10% lower than the rated voltage will cause battery depletion; 3. Avoid water entering the battery during charging.

[GenevieveRose]

As a seasoned driver with over twenty years of experience, I've encountered numerous battery issues. Non-maintenance batteries failing to charge are mostly due to aging or sulfation. Aging refers to the internal material degradation after three to four years of use, making it unable to hold a charge. Sulfation occurs when crystals form and harden on the positive and negative plates during prolonged disuse, obstructing current flow. It could also be a fault in the vehicle's charging system, such as a loose alternator belt or a faulty voltage regulator causing insufficient output. When checking, use a multimeter to measure the battery voltage; if it's below 10V, the battery is essentially dead. Charger issues are also common—if the current is too low or the voltage setting is incorrect, charging is ineffective. In such cases, don't attempt DIY fixes. First, try slow charging for a few hours. If that doesn’t work, visit a professional shop for inspection or replace the battery to avoid the danger of being stranded. Regular battery testing can extend its lifespan and reduce hassles.

[DeXavier]

As an average car owner with limited experience, don't panic when your battery won't charge. There are several common reasons: First, the battery may have reached the end of its lifespan - maintenance-free batteries typically last only 3-5 years. Second, loose or corroded terminal connections need cleaning and tightening. It could also be caused by deep discharge, like leaving headlights on or prolonged vehicle inactivity draining the battery. The charger might be faulty with insufficient power or abnormal output - try a better quality one. Last time I encountered this, I discovered my alternator voltage was low - check by running the engine to see if the battery warning light illuminates. I recommend getting a compact battery tester to check voltage at home; if it's below 11.5V, just replace the battery for convenience and safety. For prevention, drive your car for at least half an hour weekly to keep the battery charged.

[KarterFitz]

I always enjoy tinkering with my car. When the battery won't charge, it's usually due to sulfation or internal aging. Sulfide crystals block the plates, preventing current flow; aging means structural deterioration makes charging ineffective. Use a multimeter to check voltage and current during inspection - if below normal values, professional handling is needed. Also choose the right charger, avoid excessive current which can damage the battery. Vehicle alternator issues may also affect charging - measure if the output voltage is stable. Try slow charging or equalization charging to dissolve crystals, otherwise replace the battery since new ones aren't expensive. Regular maintenance can prevent this - fully charge before storage and keep in a cool place.